Tread plate flooring



FIG. 1 is a front perspective view of the tread flooring, showing the tread plate in broken lines;

FIG. 2 is a top plan view showing the tread in broken lines thereof; and,

FIG. 3 is a left side view showing the tread in broken lines, the right side view being a mirror image thereof.

The broken lines are for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a thread plate flooring, as shown and described. 